components/page_load_metrics/renderer/page_timing_metrics_sender.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/callback.h"
   6 #include "base/time/time.h"
   7 #include "base/timer/timer.h"
   8 #include "components/page_load_metrics/common/page_load_metrics_messages.h"
   9 #include "components/page_load_metrics/renderer/page_timing_metrics_sender.h"
  10 #include "ipc/ipc_sender.h"
  11
  12 namespace page_load_metrics {
  13
  14 namespace {
  15 const int kTimerDelayMillis = 1000;
  16 }  // namespace
  17
  18 PageTimingMetricsSender::PageTimingMetricsSender(IPC::Sender* ipc_sender,
  19                                                  int routing_id,
  20                                                  scoped_ptr<base::Timer> timer)
  21     : ipc_sender_(ipc_sender), routing_id_(routing_id), timer_(timer.Pass()) {}
  22
  23 // On destruction, we want to send any data we have if we have a timer
  24 // currently running (and thus are talking to a browser process)
  25 PageTimingMetricsSender::~PageTimingMetricsSender() {
  26   if (timer_->IsRunning()) {
  27     timer_->Stop();
  28     SendNow();
  29   }
  30 }
  31
  32 void PageTimingMetricsSender::Send(const PageLoadTiming& timing) {
  33   if (timing == last_timing_)
  34     return;
  35
  36   // We want to make sure that each PageTimingMetricsSender is associated
  37   // with a distinct page navigation. Because we reset the object on commit,
  38   // we can trash last_timing_ on a provisional load before SendNow() fires.
  39   if (!last_timing_.navigation_start.is_null() &&
  40       last_timing_.navigation_start != timing.navigation_start) {
  41     return;
  42   }
  43
  44   last_timing_ = timing;
  45
  46   if (!timer_->IsRunning())
  47     timer_->Start(
  48         FROM_HERE, base::TimeDelta::FromMilliseconds(kTimerDelayMillis),
  49         base::Bind(&PageTimingMetricsSender::SendNow, base::Unretained(this)));
  50 }
  51
  52 void PageTimingMetricsSender::SendNow() {
  53   ipc_sender_->Send(
  54       new PageLoadMetricsMsg_TimingUpdated(routing_id_, last_timing_));
  55 }
  56
  57 }  // namespace page_load_metrics